Stealth Operator Series 8 GPM 4000 PSI Belt-Driven Commercial Pressure Washer Skid – Honda GX690 & General Pump TSF2021
The Stealth Operator Series 8 GPM 4000 PSI Pressure Washer Skid is the industry's proven workhorse configuration for professional pressure washing contractors. Combining high water volume with commercial-grade pressure, this machine is built to tackle everything from residential concrete cleaning and commercial property maintenance to fleet washing, heavy equipment cleaning, drone cleaning, and large-scale flatwork production.
Powered by the Honda GX690 V-Twin Electric Start Engine and paired with the legendary General Pump TSF2021 belt-driven triplex plunger pump, this system delivers the performance, durability, and reliability serious contractors depend on every day. The belt-drive design reduces pump RPM, heat, and vibration while improving water-drawing capability from buffer tanks, making it one of the most popular configurations found on professional pressure washing trailers.
Every Stealth Sprayers machine is now built on a commercial aluminum skid platform. Constructed from precision-cut 6061-T6 structural aluminum, the skid provides exceptional strength while remaining lightweight and corrosion resistant. Unlike generic mounting rails commonly found on commercial pressure washers, the Stealth skid is purpose-built for professional cleaning equipment, featuring a clean layout, improved service access, integrated vibration isolation, and laser-cut STEALTH branding that gives the system a premium, professional appearance on trailers, truck beds, and mobile wash rigs.
Every Stealth pressure washer arrives prefilled with oil and includes both engine and pump oil drain hoses for simplified maintenance right out of the box.
Whether you're building your first commercial rig or expanding an established fleet, the Stealth Operator Series 8 GPM 4000 PSI skid delivers professional cleaning performance without compromise.
⚠️ SHIPPING RESTRICTION: Due to state regulations, this equipment is restricted from sale and shipment to California.
What's Included
Engine + Pump Assembly: Honda GX690 V-Twin electric start engine paired with a General Pump TSF2021 belt-driven triplex plunger pump
General Pump YU21405 Unloader: Commercial 21 GPM, 4050 PSI rated trapped pressure unloader for smooth operation and consistent pressure regulation
Premium Stealth 6061-T6 Aluminum Skid: Mount-ready platform for trailers, flatbeds, service trucks, and custom builds
Prefilled with Oil: Engine and pump arrive prefilled and ready for installation
Engine & Pump Oil Drain Hoses: Pre-installed for easier routine maintenance
Introducing the Operator Series: Built to Work. Ready to Lead.
The Operator Series represents the backbone of the Stealth pressure washing lineup. Built around proven commercial components and designed for real-world jobsite conditions, these machines deliver the reliability, serviceability, and performance contractors need to generate revenue every day.
From residential concrete cleaning and commercial property maintenance to fleet washing and heavy equipment restoration, Operator Series systems are engineered to keep working long after lesser machines have been retired.
Operator Series: The Backbone of Professional Cleaning.
Frequently Asked Questions
What can an 8 GPM 4000 PSI pressure washer clean?
An 8 GPM 4000 PSI pressure washer is commonly used for concrete cleaning, commercial property maintenance, fleet washing, drone cleaning, heavy equipment cleaning, parking garages, drive-thrus, industrial facilities, and large-scale flatwork. It provides enough flow for high production rates while maintaining the pressure needed for demanding cleaning applications.
What size surface cleaner can an 8 GPM 4000 PSI pressure washer run?
Most contractors run a 28" to 36" surface cleaner with an 8 GPM 4000 PSI machine. A 32" surface cleaner is often considered the sweet spot between productivity and cleaning performance. Proper nozzle sizing is equally important to achieve optimal results.
Why is 8 GPM considered the industry workhorse?
The 8 GPM platform offers an ideal balance of cleaning speed, pressure, and equipment cost. It provides enough water volume to dramatically increase productivity over 4–5.5 GPM machines while remaining practical for daily commercial use.
Is belt drive better than direct drive?
For professional applications, many contractors prefer belt drive because it reduces pump RPM, vibration, and heat while extending pump life. Belt-drive systems also tend to pull water from buffer tanks more effectively.
Can this pressure washer pull water from a buffer tank?
Yes. This machine is designed for professional trailer and skid applications and is commonly supplied by a buffer tank. The belt-driven TSF2021 pump offers excellent suction characteristics when properly plumbed.
Does this unit include a fuel tank?
No. This skid is intended for custom installations and does not include a fuel tank or battery cables.
Does the unit arrive with oil installed?
Yes. Both the engine and pump arrive prefilled with oil and include oil drain hoses for simplified maintenance.
Stealth 8 GPM 4000 PSI Commercial Pressure Washer | Features
Honda GX690 V-Twin Engine (Electric Start)
Commercial-grade 688cc Honda power delivers dependable starting, smooth operation, and proven reliability for professional cleaning applications.
General Pump TSF2021 Belt-Drive Pump
One of the most trusted pumps in the pressure washing industry. The TSF2021 is known for exceptional longevity, rebuildability, and field-proven performance.
Premium Stealth 6061-T6 Aluminum Skid Platform
Built from precipitation-hardened structural aluminum for maximum strength, corrosion resistance, and reduced weight. Features laser-cut Stealth branding and a professional appearance that stands apart from generic pressure washer frames.
Belt-Drive System
Reduces pump RPM, vibration, heat, and wear compared to direct-drive systems while extending pump life and lowering maintenance requirements.
Easier Water Pulling from Buffer Tanks
Longer, slower pump strokes help improve water-drawing capability from buffer tanks, making belt-drive systems the preferred choice for professional trailer builds.
General Pump YU21405 Trapped Pressure Unloader
Commercial-grade trapped pressure unloader rated up to 21 GPM and 4050 PSI. Provides smooth pressure regulation, reduced pressure spikes, and improved gun operation.
Engine & Pump Oil Drain Hoses Included
Pre-installed oil drain hoses simplify routine maintenance and make oil changes faster and cleaner.
All Stainless Steel Hardware
Corrosion-resistant hardware designed to withstand years of commercial use and harsh jobsite environments.
Built for Professional Trailer Systems
Perfect for pressure washing trailers, service trucks, flatbeds, enclosed trailers, and custom skid builds.
Industry-Leading Warranty & Support
- Honda GX690 Engine: 3-Year Warranty.
- General Pump TSF2021 Pump: 5-Year Warranty with Lifetime Manifold Guarantee.
Stealth 8 GPM 4000 PSI Unit | Specifications
| Specification | Details |
| Brand | Stealth |
| Series | Operator Series |
| Part Number | SB8035-HG |
| Made In | USA |
| Engine | Honda GX690 V-Twin OHV, 4-Stroke (Electric Start) |
| Engine Displacement | 688cc |
| Pump | General Pump TSF2021 (Triplex, Belt-Driven) |
| Pump Type | Belt-Driven Triplex Plunger |
| Pump Max Flow Rate | 8.5 GPM @ 3600 PSI |
| Operational Flow Rate | 8.0 GPM @ 4000 PSI |
| Unloader Valve | General Pump Trapped Pressure Unloader (YU21405) |
| Unloader Rated Pressure | 4050 PSI (Max 4500 PSI) |
| Unloader Max Flow Rate | 21 GPM |
| Skid Material | 6061-T6 Structural Aluminum |
| Muffler | Starter-side or oil-side muffler (depending upon availability) |
| Oil Included | Yes |
| Engine Oil Drain Hose | Included |
| Pump Oil Drain Hose | Included |
| Not Included | Gas tank, battery cables |
| Max Water Temp | 165°F |
| Warranty - Engine | 3 Years (Honda GX690) |
| Warranty - Pump | 5 Years (General Pump) + Lifetime Forged Brass Manifold Guarantee |
Stealth 8 GPM Pressure Washer | Owner's Manual
Warranty Information
| Component | Warranty Coverage | Warranty Coverage |
| Honda GX690 Engine | 3 Years | Covers defects in material and workmanship under normal use. Warranty service available through authorized Honda dealers. See More |
| General Pump TSF2021 | 5 Years | Covers defects in material and workmanship. Includes a Lifetime Manifold Warranty on the forged brass manifold. |
Call us for warranty details: 561-964-3228
